Used Dual throttle and shift controls for all types of boats. mercuiser, Volvo, and many others are in stock at our marine parts liquidator warehouse. These types of contro;s can be both helm mounted and side mounted depending on the boat type in question. Many of our dual purpose controls are Quicksilver and fit a wide variety of boats. Searay , Grady ,White, Mako, and many other manufacturers use these types of controls.